Retention of high-pressure-induced superconducting and non-superconducting phases in solids at ambient

ORAL

Abstract

To raise the Tc has been one of the main driving forces in the extensive high temperature superconductivity research for more than three decades. Record Tcs have been set for different compound systems, e.g. 164 K for the cuprates and 287 K for the C-S-H hydrides. Unfortunately, all of these are achieved under pressures, i.e. ~31 GPa for the former and 267 GPa for the latter, posing a serious obstacle for applications. To remove the obstacle, we have investigated means to retain at ambient the high-pressure phases by taking advantage of the energy barriers between different phases in solids through pressure quench at 77 K. We shall report our success in retaining at ambient the following pressure-induced phases: superconducting (sc) phases II at ~5-20 GPa and IV at ~22-62 GPa in non-sc Sb I single crystals; sc phases III at ~2.4-7 GPa and V at ~7-12 GPa in non-sc Bi I single crystals, sc tetragonal FeSe at ~2-7.5 GPa and non-sc hexagonal FeSe above ~8 GPa in sc orthogonal FeSe single crystals; and sc tetragonal Cu-doped FeSe at ~4-6 GPa in non-sc orthogonal Cu-doped FeSe single crystals. The thermal stability of each of these phases has also been determined.

*The work is supported in part by AFOSR, TLL Temple Foundation, JJ&R Moores Endowment, and TCSUH.

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Presenters

  • Paul C. W. Chu

    • University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity and Department of Physics, University of Houston

Authors

  • Paul C. W. Chu

    • University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity and Department of Physics, University of Houston

  • Liangzi Deng

    • University of Houston
    • Texas Center for Superconductivity, University of Houston
    • Texas Center for Superconductivity & Physics Department at University of Houston
    • University of Houston, Texas Center for Superconductivity
    • Texas Center of Superconductivity and Physics Department at the University of Houston
    • TcSUH and Dept of Physics, University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity and Department of Physics, University of Houston

  • Zheng Wu

    • University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity and Department of Physics, University of Houston

  • Trevor Bontke

    • University of Houston
    • Texas Center for Superconductivity & Physics Department at University of Houston
    • Texas Center of Superconductivity and Physics Department at the University of Houston

  • Shuyuan Huyan

    • University of Houston

  • Melissa Gooch

    • University of Houston
    • TcSUH and Dept of Physics, University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity and Department of Physics, University of Houston

  • Rabin Dahal

    • University of Houston
    • Texas Center for Superconductivity & Physics Department at University of Houston
    • Texas Center of Superconductivity and Physics Department at the University of Houston

  • Bin Gao

    • Rice University
    • Rutgers Center for Emergent Materials, Rutgers University
    • Department of Physics and astronomy, Rice University
    • Department of Physics and Astronomy, Rice University
    • Rice Univ

  • Tong Chen

    • Rice University
    • Department of Physics and astronomy, Rice University
    • Rice Univ

  • Pengcheng Dai

    • Rice Univ
    • Rice University
    • Department of Physics and astronomy, Rice University
    • Department of Physics and Astronomy, Rice University